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venning/standard_deviation.js

Created October 17, 2015 09:10
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Standard Deviation with lodash
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standard_deviation.js
// NOTE requires lodash v3.4.0+ (for _.sum) and Node 4.0+ (for arrow function)
var _ = require('lodash');
function σ (array) {
var avg = _.sum(array) / array.length;
return Math.sqrt(_.sum(_.map(array, (i) => Math.pow((i - avg), 2))) / array.length);
};
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